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Open Access
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Content licence CC BY 4.0
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This is original content, published in Open Access. It is also available to read for free online at https://media.fupress.com/files/pdf/24/3780/3780_17382
It is available to read for free online
It is available for online purchase at https://books.fupress.com/isbn/9788864537818
Paper, milk, clouds and white paint share a common property: they are opaque disordered media through which light scatters randomly rather than propagating in a straight path. For very thick and turbid media, indeed, light eventually propagates in a ‘diffusive’ way, i.e. similarly to how tea infuses through hot water. Frequently though, a material is neither perfectly opaque nor transparent and the simple diffusion model does not hold. In this work, we developed a novel optical-gating setup that allowed us to observe light transport in scattering media with sub-ps time resolution. An array of unexplored aspects of light propagation emerged from this spatio-temporal description, unveiling transport regimes that were previously inaccessibile due to the extreme time scales involved and the lack of analytical models.
It is available online at https://doi.org/10.36253/978-88-6453-781-8